In a first for the beloved science-fiction franchise, Sunday’s episode of “Star Trek: Discovery” featured a kiss between Lt. Stamets (Anthony Rapp) and Dr. Hugh Culber (Wilson Cruz). The two men had been building their romantic relationship all season, but this was their first on-screen smooch ― and boy, it was steamy.

Queer director Q. Allan Brocka tweeted out a clip of the lip lock on Tuesday.

For some Trekkies, the kiss marked the start of a new chapter in the franchise, which has been pushing cultural boundaries since it first aired in 1966. Though a 1995 episode of “Star Trek: Deep Space Nine” titled “Rejoined” featured a kiss between two women, this was the first time two men have smooched on the series ― and, in this case, the characters are in a committed, same-sex relationship.

“In this political and cultural climate in which some people want to divide us, I hope ‘Discovery’ will help to remind us that at the cellular level, there is no separation between us and in fact, we all long for the same things,” he said.